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Annotation of 43BSDReno/usr.bin/window/context.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1983 Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * This code is derived from software contributed to Berkeley by
                      6:  * Edward Wang at The University of California, Berkeley.
                      7:  *
                      8:  * Redistribution and use in source and binary forms are permitted provided
                      9:  * that: (1) source distributions retain this entire copyright notice and
                     10:  * comment, and (2) distributions including binaries display the following
                     11:  * acknowledgement:  ``This product includes software developed by the
                     12:  * University of California, Berkeley and its contributors'' in the
                     13:  * documentation or other materials provided with the distribution and in
                     14:  * all advertising materials mentioning features or use of this software.
                     15:  * Neither the name of the University nor the names of its contributors may
                     16:  * be used to endorse or promote products derived from this software without
                     17:  * specific prior written permission.
                     18:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
                     19:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
                     20:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     21:  */
                     22: 
                     23: #ifndef lint
                     24: static char sccsid[] = "@(#)context.c  3.12 (Berkeley) 6/6/90";
                     25: #endif /* not lint */
                     26: 
                     27: #include "value.h"
                     28: #include "string.h"
                     29: #include "context.h"
                     30: 
                     31: /*
                     32:  * Context push/pop for nested command files.
                     33:  */
                     34: 
                     35: char *malloc();
                     36: 
                     37: cx_alloc()
                     38: {
                     39:        register struct context *xp;
                     40: 
                     41:        if (cx.x_type != 0) {
                     42:                xp = (struct context *)
                     43:                        malloc((unsigned) sizeof (struct context));
                     44:                if (xp == 0)
                     45:                        return -1;
                     46:                *xp = cx;
                     47:                cx.x_link = xp;
                     48:                cx.x_type = 0;
                     49:        }
                     50:        cx.x_erred = 0;
                     51:        cx.x_synerred = 0;
                     52:        cx.x_abort = 0;
                     53:        return 0;
                     54: }
                     55: 
                     56: cx_free()
                     57: {
                     58:        struct context *xp;
                     59: 
                     60:        if ((xp = cx.x_link) != 0) {
                     61:                cx = *xp;
                     62:                free((char *)xp);
                     63:        } else
                     64:                cx.x_type = 0;
                     65: }
                     66: 
                     67: cx_beginfile(filename)
                     68: char *filename;
                     69: {
                     70:        if (cx_alloc() < 0)
                     71:                return -1;
                     72:        cx.x_type = X_FILE;
                     73:        if ((cx.x_filename = str_cpy(filename)) == 0)
                     74:                goto bad;
                     75:        cx.x_fp = fopen(filename, "r");
                     76:        if (cx.x_fp == 0)
                     77:                goto bad;
                     78:        cx.x_bol = 1;
                     79:        cx.x_lineno = 0;
                     80:        cx.x_errwin = 0;
                     81:        cx.x_noerr = 0;
                     82:        return 0;
                     83: bad:
                     84:        if (cx.x_filename != 0)
                     85:                str_free(cx.x_filename);
                     86:        cx_free();
                     87:        return -1;
                     88: }
                     89: 
                     90: cx_beginbuf(buf, arg, narg)
                     91: char *buf;
                     92: struct value *arg;
                     93: int narg;
                     94: {
                     95:        if (cx_alloc() < 0)
                     96:                return -1;
                     97:        cx.x_type = X_BUF;
                     98:        cx.x_bufp = cx.x_buf = buf;
                     99:        cx.x_arg = arg;
                    100:        cx.x_narg = narg;
                    101:        return 0;
                    102: }
                    103: 
                    104: cx_end()
                    105: {
                    106:        switch (cx.x_type) {
                    107:        case X_BUF:
                    108:                break;
                    109:        case X_FILE:
                    110:                (void) fclose(cx.x_fp);
                    111:                str_free(cx.x_filename);
                    112:                break;
                    113:        }
                    114:        cx_free();
                    115: }

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